I've noticed that since the update I can no longer select my cloud server as a library. Is this intentional?
Same issue here.
Unfortunately it is intentional - PMS v1.10, which is the update's minimum version, shipped with an improved playback profile for Sonos, which is how the app decides if something can be direct played or needs to be transcoded. We're investigating if we can use augment a generic profile to be able to support older PMS versions.
When is Plex updating the Cloud PMS?